mirror of https://gitee.com/openkylin/linux.git
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
/*
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* CTC / LCS ccw_device driver
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Arnd Bergmann <arndb@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/s390_rdev.h>
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#include <asm/ccwdev.h>
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#include <asm/ccwgroup.h>
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#include "cu3088.h"
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const char *cu3088_type[] = {
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"not a channel",
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"CTC/A",
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"ESCON channel",
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"FICON channel",
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"P390 LCS card",
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"OSA LCS card",
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"CLAW channel device",
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"unknown channel type",
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"unsupported channel type",
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};
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/* static definitions */
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static struct ccw_device_id cu3088_ids[] = {
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{ CCW_DEVICE(0x3088, 0x08), .driver_info = channel_type_parallel },
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{ CCW_DEVICE(0x3088, 0x1f), .driver_info = channel_type_escon },
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{ CCW_DEVICE(0x3088, 0x1e), .driver_info = channel_type_ficon },
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{ CCW_DEVICE(0x3088, 0x01), .driver_info = channel_type_p390 },
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{ CCW_DEVICE(0x3088, 0x60), .driver_info = channel_type_osa2 },
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{ CCW_DEVICE(0x3088, 0x61), .driver_info = channel_type_claw },
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{ /* end of list */ }
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};
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static struct ccw_driver cu3088_driver;
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struct device *cu3088_root_dev;
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static ssize_t
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group_write(struct device_driver *drv, const char *buf, size_t count)
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{
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const char *start, *end;
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char bus_ids[2][BUS_ID_SIZE], *argv[2];
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int i;
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int ret;
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struct ccwgroup_driver *cdrv;
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cdrv = to_ccwgroupdrv(drv);
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if (!cdrv)
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return -EINVAL;
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start = buf;
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for (i=0; i<2; i++) {
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static const char delim[] = {',', '\n'};
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int len;
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if (!(end = strchr(start, delim[i])))
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return -EINVAL;
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len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
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strlcpy (bus_ids[i], start, len);
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argv[i] = bus_ids[i];
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start = end + 1;
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}
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ret = ccwgroup_create(cu3088_root_dev, cdrv->driver_id,
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&cu3088_driver, 2, argv);
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return (ret == 0) ? count : ret;
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}
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static DRIVER_ATTR(group, 0200, NULL, group_write);
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/* Register-unregister for ctc&lcs */
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int
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register_cu3088_discipline(struct ccwgroup_driver *dcp)
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{
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int rc;
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if (!dcp)
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return -EINVAL;
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/* Register discipline.*/
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rc = ccwgroup_driver_register(dcp);
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if (rc)
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return rc;
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rc = driver_create_file(&dcp->driver, &driver_attr_group);
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if (rc)
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ccwgroup_driver_unregister(dcp);
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return rc;
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}
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void
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unregister_cu3088_discipline(struct ccwgroup_driver *dcp)
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{
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if (!dcp)
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return;
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driver_remove_file(&dcp->driver, &driver_attr_group);
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ccwgroup_driver_unregister(dcp);
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}
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static struct ccw_driver cu3088_driver = {
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.owner = THIS_MODULE,
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.ids = cu3088_ids,
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.name = "cu3088",
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.probe = ccwgroup_probe_ccwdev,
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.remove = ccwgroup_remove_ccwdev,
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};
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/* module setup */
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static int __init
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cu3088_init (void)
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{
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int rc;
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cu3088_root_dev = s390_root_dev_register("cu3088");
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if (IS_ERR(cu3088_root_dev))
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return PTR_ERR(cu3088_root_dev);
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rc = ccw_driver_register(&cu3088_driver);
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if (rc)
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s390_root_dev_unregister(cu3088_root_dev);
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return rc;
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}
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static void __exit
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cu3088_exit (void)
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{
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ccw_driver_unregister(&cu3088_driver);
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s390_root_dev_unregister(cu3088_root_dev);
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}
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MODULE_DEVICE_TABLE(ccw,cu3088_ids);
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MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
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MODULE_LICENSE("GPL");
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module_init(cu3088_init);
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module_exit(cu3088_exit);
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EXPORT_SYMBOL_GPL(cu3088_type);
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EXPORT_SYMBOL_GPL(register_cu3088_discipline);
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EXPORT_SYMBOL_GPL(unregister_cu3088_discipline);
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